Prediction of infiltration from soil hydraulic properties
Field and laboratory infiltration measurements
using infiltrometers have been the only methods of effectively determining the
infiltration rates of soils. Infiltration is mainly controlled by soil
hydraulic properties, especially the hydraulic conductivity. Due to the ease
with which the saturated hydraulic conductivity can be determined, it is often
preferred to the unsaturated hydraulic conductivity in hydrological studies. It
is well known that, at saturation the steady state infiltrability controls the
infiltration process. Thus, it is very clear that the saturated hydraulic
conductivity
and
steady state infiltrability
may be
closely related in one way or the other, as suggested in some few studies,
wherein functions have been developed to relate these two parameters. However,
these functions are often site specific and do not always carry out accurately
all the time. Determination of
can be
tedious and time consuming, whereas
can be
easily determined in the laboratory. The present study aimed to assess the
predictability of a modified Philip’s equation by substituting
for
. In this study, field infiltration measurements
were conducted in two soil types under three different land use systems with a
single ring infiltrometer. Field and laboratory hydraulic and hydrologic
experiments were conducted on soils in a turf grass, an arable land and a
pastureland in the Kwame Nkrumah University of Science and Technology, Kumasi,
Ghana. Goodness-of-fit was used to compare the measured and predicted
cumulative infiltration amounts from both
and
. The results showed that there was a robust
relationship between the measured and predicted cumulative infiltration amount
values from the Philip’s and modified Philip’s equations, respectively for all
three fields. However, the use of
in place of
produced
the best outcome in all the study areas. Thus, substituting
for
in the
Philip’s infiltration equation can better predict cumulative infiltration
amount. The proposed modified Philip’s infiltration equation and the key
parameters (i.e.,
and
) provide new understanding into the realistic
flow processes in soil. Furthermore, the
in the
new equation is very close to the measured
.
Keywords:
Cumulative infiltration amount, manometer saturated hydraulic conductivity, sorptivity, steady state infiltrability,
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- Yayın Aralığı: Yılda 4 Sayı
- Başlangıç: 2012
- Yayıncı: Avrasya Toprak Bilimleri Dernekleri Federasyonu
Sayıdaki Diğer Makaleler
Rubya SHABNAM, Md. Toufiq IQBAL
Milad Mirzaei AMİNİYAN, Hamideh HOSSEİNİ, Amin HEYDARİYAN
Henry Oppong TUFFOUR, Joseph ASARE, Gilbert Mcphelan NUTAKOR
Elham KALANTARİ, Alimorad HASSANLİ, Gholam Abbas GHANBARİAN, Ali Asghar GHAEMİ, Sayed Roholla MOUSAVİ
Tuğrul YAKUPOĞLU, Tamer RIZAOĞLU, Turgay DİNDAROĞLU, Sertan SESVEREN, Zekeriya KARA, Recep GÜNDOĞAN